Kudos Wiktionary Word of the day APP and WIDGET.

Learn a new word everday by either launching the app or including a widget on your home screen (To add a widget after installing the app tap on an empty part of your background and select 'widgets' then 'Wiktionary')
Tapping the widget will give a full explanation of the word.

Dictionary data taken from wiktionary.com
Parts of the source are taken from or modified versions of that found on the Android Developer Blog.

Offline English-Basque and Basque-English Dictionary. More than 9.000 words. FREE!

Klasik İngilizce/Türkçe(çift yönlü) offline(çevrimdışı, net bağlantısı gerektirmez) sözlük uygulaması. Özellikleri:
# İngilizce kelimelerin telaffuzunu duyabilme (telefonunuzda text to speech yüklü olamlı)
# Anlamına bakılan son kelimeleri görebilme(geçmiş)
# Anlamına bakılan bir kelimeyi quiz listesine atma ve bu kelimelerden test olabilme
# Geniş veritabanı

WiFiReaver. Wireless File Reaver.

Automatic key injection using Dictionary for Wireless Networks.

Inyector automático de claves mediante Diccionario para Redes Wireless.

http://WiFiReaver.blogspot.com
http://Buckynet.blogspot.com

User Dictionary Manager (UDM) allows you to edit/export/import/delete/clean the user dictionary words on your Android phone.

WARNING: UDM does NOT work on some HTC phones because they have nonstandard Android implementation.

HTC Tatoo - does NOT work
HTC Hero - does NOT work
HTC Sense - does NOT work
HTC Eris - does NOT work
HTC Desire - does NOT work
HTC with custom root - probably NOT

Nexus One - DOES work
G1 - DOES work

Includes a built in list of approx 2000 most used words/expressions in the Romanian language. http://udm.adrianvintu.com

Langtolang is a multilingual dictionary.

Reverse Dictionary / Thesaurus

English To Tamil Dictionary for Android Devices -Trail Version
With lot of Amazing options

Online multilingual (English, German, French, Serbian) illustrated dictionary, simultaneously translating in all directions, based on a well-established comprehensive (stonito.com) dictionary.
Many terms have illustrations that are easily visible as a pop-up images on clicking appropriate link. Three different search options are supported:

1. search by words starting with,
2. words containing,
3. full-text search on all text

Dictionary of guitar chords. 3 positions by chord, up to 5 chords simultaneously. Version for Android 1.5

Dictionary of guitar chords. 3 positions by chord, up to 5 chords simultaneously.

WiFiReaver. Wireless File Reaver.

Automatic key injection using Dictionary for Wireless Networks.

Inyector automático de claves mediante Diccionario para Redes Wireless.

http://WiFiReaver.blogspot.com
http://Buckynet.blogspot.com

Multitool language app.

-Translates words between English and Spanish.

-The translator works offline.

-The dictionary has 106 000 words and performs reverse word translations. You can send by e-mail or SMS the translation.

-Common phrases/expressions categorized by situations (hotel,restaurant,airport,shopping,public transportation,health) to handle a variety of situations while traveling abroad.

-Spanish verbs and online translator included.

Easy Vocabulary can be used as a vocabulary trainer or dictionary in any language.
Import or export word lists in CSV format. Find, add, edit, or delete words.
Learn vocabulary with an index card system in read, select or write mode. Have fun with Easy Vocabulary.

Color Dictionary is designed for user who want to find the common colors.You can find the color by english name,chinese name or hex code.And And the tool of Color Converter has a simple interface to adjust and display colors in RGB,Hex,CMYK and HSB.

Langenscheidt Standard-Wörterbuch Spanisch contains 83,389 entries (365,000 references and translations).

FEATURES:
•Both translation directions (German<->Spanish)
•Audio pronunciation
•Look up translations from the home screen
•Learning tools: Word of the Day, Flash Cards
•Translate Spanish words from any grammatical form

Langenscheidt Standard-Wörterbuch Russisch contains 74,856 entries (250,000 references and translations).

FEATURES:
•Both translation directions (German<->Russian)
•Audio pronunciation
•Look up translations from the home screen
•Learning tools: Word of the Day, Flash Cards
•Translate Russian words from any grammatical form

Langenscheidt Standard-Wörterbuch Italienisch contains 76,112 entries (365,000 references and translations).

FEATURES:
•Both translation directions (German<->Italian)
•Audio pronunciation
•Look up translations from the home screen
•Learning tools: Word of the Day, Flash Cards
•List of similarly spelt words

Langenscheidt Standard-Wörterbuch Französisch contains 80,551 entries (365,000 references and translations.)

FEATURES:
•Both translation directions (German<->French)
•Audio pronunciation
•Look up translations from the home screen
•Learning tools: Word of the Day, Flash Cards
•List of similarly spelt words

Langenscheidt Basic-Wörterbuch Spanisch contains 39,453 entries (140,000 references and translations).

FEATURES:
•Both translation directions (German<->Spanish)
•Audio pronunciation
•Look up translations from the home screen
•Learning tools: Word of the Day, Flash Cards
•List of similarly spelt words